This case study assesses the impact of green tourism on tourist decision-making while booking holidays with Thomas Cook, UK. It aims to analyze the importance of green tourism for Thomas Cook, evaluate the relationship between green tourism and tourist decision-making, identify the advantages of green tourism for the company, and recommend alternative strategies for influencing tourist decisions. The research uses a valid methodology to ensure the authenticity of the information gathered. Key themes explored include the strong relationship between green tourism and tourist decision-making, the importance of adopting green tourism practices for tourist satisfaction, Thomas Cook's environmental responsibility, the long-term importance of green tourism for the company's sustainability, the influence of green tourism practices on tourist decisions compared to other factors like discounts and prices, and the benefits of improved relationships with tourists through green initiatives. The study also examines employee engagement in eco-friendly service delivery and the potential for increased customer base through improved green tourism practices. The research references various sources to support its findings and analysis.